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    内蒙古赤峰地区土壤与北沙参、桔梗中钼元素地球化学特征及生境适宜性评价

    Geochemical characteristics of molybdenum element and habitat suitability evaluation in soils, Glehniae Radix and Platycodon grandiflorus in Chifeng region, Inner Mongolia

      摘要
    • 摘要:
      研究目的 开展土壤与北沙参、桔梗中钼元素地球化学特征及生境适宜性评价研究，为药材种植管理标准化与科学化提供地学方案。
      研究方法 运用描述性统计、相关性分析、生物富集系数和中药材生境适宜性评价模型等方法，探讨土壤与北沙参、桔梗中钼含量特征及影响因素，评价北沙参生境适应性等级。
      研究结果 表层土壤Mo含量为0.45~2.87 mg/kg，均值为0.68 mg/kg。北沙参和桔梗根系土钼含量为0.55~1.05 mg/kg，均值为0.75 mg/kg，属丰富—较丰富水平；北沙参Mo含量为0.31~1.00 mg/kg，均值为0.63 mg/kg，BCF北沙参为83.28%；桔梗Mo含量为0.07~0.79 mg/kg，均值为0.33 mg/kg，BCF桔梗为45.39%；富钼根系土为北沙参、桔梗生长提供了丰富的Mo源，碱性土壤促进钼元素在土壤与北沙参、桔梗中的迁移富集。
      结论 富钼土壤的钼主要来源于成土母质，其次来源于地形地貌及农业施肥等多种因素引起的次生富集。土壤与北沙参、桔梗中钼元素迁移富集是一个复杂的生物地球化学过程，是药材基因特性、土壤钼全量、钼形态特征、pH、有机质、Eh、黏土矿物以及其他微量元素（协同或拮抗）与钼之间地球化学性质综合作用的结果。北沙参、桔梗中As、Cd、Cu、Hg和Pb重金属单项含量或总量均符合外经贸绿色行业标准。北沙参生境适宜性综合评价结果为最适宜等级，土地利用类型生产适宜性等级为适宜等级。

       

      Abstract:
      This paper is the result of ecological geological survey engineering.
      Objective This paper aims to study the geochemical characteristics and habitat suitability evaluation of Mo in soil, Glehniae Radix and Platycodon grandiflorus, and to provide a geological scheme for the standardization and scientific management of medicinal materials.
      Methods Descriptive statistics, correlation analysis, bioconcentration factor and habitat suitability evaluation model of Chinese herbal medicines were used to research the characteristics and influencing factors of molybdenum content in soil, Glehniae Radix and Platycodon grandiflorus, and to evaluate the habitat adaptability level of Glehnia littoralis.
      Results The surface soil Mo content is 0.45−2.87 mg/kg, with an average of 0.68 mg/kg. The Mo content in the root soil of Glehniae Radix and Platycodon grandiflorus is 0.55−1.05 mg/kg, with an average of 0.75mg/kg, which is richer–rich level. The Mo content of Glehniae Radix is 0.31−1.00 mg/kg, with an average of 0.63 mg/kg, and the BCFGlehniae Radix is 83.28%. The Mo content of Platycodon grandiflorus is 0.07−0.79mg/kg, with an average of 0.33 mg/kg, and the BCFPlatycodon grandiflorus is 45.39%. The Mo-rich root soil provides a rich source of Mo for the growth of Glehniae Radix and Platycodon grandifloras. Alkaline soil promotes the migration and enrichment of Mo in the soil, Glehniae Radix and Platycodon grandiflorus.
      Conclusions The Mo source of Mo-rich soil is mainly derived from soil parent material, followed by secondary enrichment caused by various factors such as topography and agricultural fertilization. Mo migration and enrichment in soil, Glehniae Radix and Platycodon grandiflorus is a complex biogeochemical process, which is the result of the comprehensive effect of genetic characteristics of medicinal materials, a total amount of Mo in soil, morphological characteristics of Mo, pH organic matter, Eh, clay minerals, and other trace elements (synergistic or antagonistic) and geochemical properties of Mo. The single or total contents of As, Cd, Cu, Hg and Pb in Glehniae Radix and Platycodon grandiflorus were in line with the green industry standards of foreign trade. The comprehensive evaluation results of habitat suitability of Glehniae Radix are the most suitable grade, and the production suitability grade of land use type is suitable grade.

       

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